Final answer:
The representative should apologize to the customer and ask her to bring the dress back for further alterations.
Step-by-step explanation:
The customer service representative should apologize to the customer for the inconvenience and assure her that they will resolve the issue. They should then ask the customer to bring the dress back to the bridal shop for further alterations to make it the correct length. The representative can offer a discount or compensation for the inconvenience to show goodwill and maintain a positive customer relationship.